package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import javax.print.attribute.standard.MediaName;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面实现公共字段填充
 */
@Component
@Aspect
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) &&@annotation(com.sky.annotation.AutoFill)")
    public void pt(){}
    @Before("pt()")
    public void autoFill(JoinPoint joinPoint){
       log.info("开始进行公共字段填充...");
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //getMethod 方法的基本用法是从类的Class对象中获取一个特定的方法。
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获取注解对象
        OperationType value = annotation.value();
        //获取当前被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }
        Object arg = args[0];
        //准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        //通过对应反射属性来进行赋值
        if(value==OperationType.INSERT){
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(arg,time);
                setCreateUser.invoke(arg,id);
                setUpdateTime.invoke(arg,time);
                setUpdateUser.invoke(arg,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        if(value==OperationType.UPDATE){
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(arg,time);
                setUpdateUser.invoke(arg,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}
